Effect of Feed Composition on the Selection of Control Structures for High-Purity Binary Distillation

2005 ◽  
Vol 44 (20) ◽  
pp. 7800-7813 ◽  
Author(s):  
William L. Luyben
Keyword(s):  
High Purity ◽  
Feed Composition ◽  
Control Structures ◽  
Selection Of

scholarly journals Selection of Decentralised Control Structures: Structural Methodologies and Diagnostics

2016 ◽  
Vol 49 (9) ◽  
pp. 80-85 ◽  
Author(s):  
N. Karcanias ◽  
J. Leventides ◽  
E. Milonidis ◽  
I. Meintanis
Keyword(s):  
Control Structures ◽  
Decentralised Control ◽  
Selection Of

scholarly journals Effect of Gate Selection on the Non-Cohesive Sedimentation in Irrigation Schemes

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2765
Author(s):  
Shaimaa Theol ◽  
Bert Jagers ◽  
Jigyasha Rai Yangkhurung ◽  
F.X. Suryadi ◽  
Charlotte de Fraiture
Keyword(s):  
Cohesive Sediment ◽  
Sediment Deposition ◽  
Hydraulic Parameters ◽  
Crop Water ◽  
Gate Operation ◽  
Control Structures ◽  
Sediment Removal ◽  
1D Model ◽  
The Impact ◽  
Selection Of

In order to cover the crop water requirements, flow control structures such as gates and weirs are used to transfer the desired amount of water from the canals to the field canals. This paper examines the impact of gate operation and the selection of gates on the deposition of non-cohesive sediment. The Delft3D model is used to simulate the effects of different scenarios regarding gate operation and the location of the gate that is opened. The model results showed that the gate selection affects not only hydraulic parameters but also morphological parameters. It was found that opening the gates closer to the offtake resulted in less sediment deposition at the entrance of the branch canal when compared to opening the gates further away. Gate selection can be used as a tool in sediment management. By alternating the opening of different gates sediments that are already deposited after opening one gate can be eroded when another gate is operated, thus minimizing the additional cost of sediment removal. The use of Delft3D proved beneficial as the selection of different gates leads to asymmetric sediment deposition patterns which would be missed when using a 1D model.

USE OF A TOOL FOR THE SELECTION OF CONTROL STRUCTURES IN PETROCHEMICAL PROCESSES

2015 ◽  
Author(s):  
Adriana Barbosa da Costa ◽  
Francieudeny Leite Gonçalves ◽  
Savana Barbosa de Brito Lélis Villar ◽  
Sidinei Kleber da Silva ◽  
Antonio Carlos Brandão de Araújo ◽  
...  
Keyword(s):  
Control Structures ◽  
Selection Of

THE FREEZING POINTS OF HIGH PURITY METALS AS PRECISION TEMPERATURE STANDARDS: VI. THERMAL ANALYSES ON FIVE SAMPLES OF LEAD WITH PURITIES GREATER THAN 99.999+%

1960 ◽  
Vol 38 (5) ◽  
pp. 577-587 ◽  
Author(s):  
E. H. McLaren ◽  
E. G. Murdock
Keyword(s):  
High Purity ◽  
Thermal Analyses ◽  
Solidus Temperature ◽  
Freezing Temperature ◽  
Liquidus Point ◽  
Pure Lead ◽  
Melting Temperatures ◽  
A Value ◽  
Precision Temperature ◽  
Selection Of

An investigation has been made of the freezing and melting temperatures of five samples of high purity lead (supplier's analyzed impurity contents < 0.7 to < 4 p.p.m.) including zone refined metal. Using the induced freezing technique, plateaux of essentially constant (< ±0.0001 °C) temperature with durations of over 1 hour are readily obtained on the cooling curves of these samples. A standard deviation in plateau temperature (liquidus point) of ±0.0001 °C was obtained from a series of 30 induced freezes on a particular sample. The pressure effect on the freezing temperature of lead was found to be 0.0080 °C for 1 atmosphere. A value of 327.426 °C (Int. 1948) was determined for the standard liquidus point of pure lead.The liquidus points of the samples were intercompared with a precision of about 0.0002 °C, and alloy melting ranges were examined following different types of freezing with and without overnight anneals near the solidus temperature. Alloy melting range parameters were found to be useful in the selection of the samples of highest purity and at the same time showed that an uncertainty of 0.002 °C in the above value of the liquidus point of pure lead may exist because of residual impurity contents in the purest samples that were examined.

scholarly journals Application of D-Decomposition Technique to Selection of Controller Parameters for a Two-Mass Drive System

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6614
Author(s):  
Radosław Nalepa ◽  
Karol Najdek ◽  
Karol Wróbel ◽  
Krzysztof Szabat
Keyword(s):  
Analytical Formula ◽  
Drive System ◽  
Decomposition Technique ◽  
Motor Speed ◽  
Control Structures ◽  
Drive Systems ◽  
The Impact ◽  
The Mathematical Model ◽  
Theoretical Considerations ◽  
Selection Of

In this work, issues related to the application of the D-decomposition technique to selection of the controller parameters for a drive system with flexibility are presented. In the introduction the commonly used control structures dedicated to two-mass drive systems are described. Then the mathematical model as well as control structure are introduced. The considered structure has only basic feedbacks from the motor speed and PI type controller. Due to the order of the closed-loop system, the free location of the system’s poles is not possible. Large oscillations can be expected in responses of the plant. In order to improve the characteristics of the drive, the tuning methodology based on the D-decomposition technique is proposed. The initial working point is selected using an analytical formula. Then the value of controller proportional gain is decreasing, until the required value of overshoot is obtained. In the paper different advantages of the D-decomposition technique are presented, for instance calculation of global stability area for the selected gain and phase margin, the impact of parameter changes, and additional delay evident in the system. Theoretical considerations are confirmed by simulation and experimental results.

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